Douglass Quarry (Paleocene of the United States)

Also known as Simpson's Locality 63

Where: Sweetgrass County, Montana (45.8° N, 109.8° W: paleocoordinates 51.8° N, 89.1° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Tiffanian (61.7 - 56.8 Ma)

• in a stratigraphically isolated reversed polarity zone interpreted as chron C26r: Butler et al. 1987

Environment/lithology: terrestrial

Primary reference: D. W. Krause and P. D. Gingerich. 1983. Mammalian Fauna from Douglass Quarry, Earliest Tiffanian (Late Paleocene) of the Eastern Crazy Mountain Basin, Montana. Contributions from the Museum of Paleontology, University of Michigan 26(9):157-196 [J. Alroy/J. Alroy/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 15025: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by K. Christopher Beard and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

• Krause and Maas 1990 give exact NISP counts that sum to 1205; however, "over 1800 identifiable specimens" are present according to Hartman and Krause 1993
Mammalia
 Cimolesta - Titanoideidae
Titanoides sp. Gidley 1917 pantodont
said to be T. "zeuxis" by Simons 1960
 Cimolesta - Cimolestidae
Paleotomus senior Simpson 1937 eutherian
Acmeodon sp.2 Matthew and Granger 1921 eutherian
 Cimolesta - Pantolestidae
Bessoecetor septentrionalis5 Russell 1929 eutherian
 Cimolesta - Pentacodontidae
Pentacodontidae indet.2 Simpson 1937 eutherian
said to be new; "cf. Aphronorus sp."
Bisonalveus browni Gazin 1956 eutherian
 Leptictida - Leptictidae
Myrmecoboides montanensis2 Gidley 1915 eutherian
Prodiacodon concordiarcensis2 Simpson 1935 eutherian
Prodiacodon furor2 Novacek 1977 eutherian
 Primates - Plesiadapidae
Plesiadapis praecursor n. sp. Gingerich 1975 primate
Nannodectes intermedius Gazin 1971 primate
 Primates - Picrodontidae
Picrodus silberlingi2 Douglass 1908 primate
 Primates - Carpolestidae
Elphidotarsius russelli2 Krause 1978 primate
 Primates - Paromomyidae
Ignacius sp.2 Matthew and Granger 1921 primate
 Dermoptera -
Elpidophorus elegans2 Simpson 1927 colugo
 Tribosphenida - Phenacodontidae
Ectocion collinus Russell 1929 condylarth
Phenacodus bisonensis Gazin 1956 condylarth
 Tribosphenida - Nyctitheriidae
Leptacodon munusculum Simpson 1935 placental
 Ferae - Viverravidae
Simpsonictis sp.2 MacIntyre 1962 placental
"Bryanictis sp." = Protictis (Bryanictis)1 MacIntyre 1966 placental
 Macroscelidea - Apheliscidae
Litomylus dissentaneus Simpson 1935 elephant shrew
Gingerichia geoteretes n. gen. n. sp.7 Zack et al. 2005 elephant shrew
said to be new
 Taeniodonta - Stylinodontidae
Psittacotherium multifragum4 Cope 1882 taeniodont
Krause and Maas 1990 do not appear to be aware of this i.d.
 Tribosphenida - Arctocyonidae
Mimotricentes ? tedfordi3 McKenna and Lofgren 2003 condylarth
Mimotricentes fremontensis Gazin 1956 condylarth
"Arctocyon cf. montanensis" = Claenodon montanensis1 Gidley 1919 condylarth
Thryptacodon ? orthogonius5 Russell 1929 condylarth
Thryptacodon cf. orthogonius5 Russell 1929 condylarth
Colpoclaenus ? keeferi2 Patterson and McGrew 1962 condylarth
Chriacus pelvidens Cope 1881 condylarth
 Acreodi - Mesonychidae
Dissacus sp.2 Cope 1881 condylarth
 Theriiformes - Peradectidae
Peradectes cf. elegans2 Matthew and Granger 1921 metatherian
 Multituberculata - Neoplagiaulacidae
Ectypodus sp.6 Matthew and Granger 1921 multituberculate
Mesodma pygmaea2 Sloan 1987 multituberculate
? Mimetodon sp.2 Jepsen 1940 multituberculate
Neoplagiaulax sp.2 Lemoine 1882 multituberculate
said to be new
Neoplagiaulax nelsoni2 Sloan 1987 multituberculate
Neoplagiaulax hunteri Simpson 1936 multituberculate
Neoplagiaulax donaldorum n. sp.6 Scott and Krause 2006 multituberculate
 Multituberculata - Ptilodontidae
Ptilodus sp. Cope 1881 multituberculate
said to be new; presumably "P. sp. T" of Krause 1987a; two forms according to Krause and Maas 1990
 Multituberculata - Cimolodontidae
"Anconodon cochranensis" = Anconodon cochranensis, "Anconodon lewisi" = Anconodon cochranensis2, Anconodon gidleyi6
"Anconodon cochranensis" = Anconodon cochranensis Russell 1929 multituberculate
"Anconodon lewisi" = Anconodon cochranensis2 Russell 1929 multituberculate
Anconodon gidleyi6 Simpson 1935 multituberculate